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本帖最后由 yoojoin 于 2015-07-24 09:37 编辑
系统openwrt 12.09 adjust, x86, 拨号上网,容易出下面日志,但还能正常上网,dhcp没有出现过。
[62668.659168] ======================================================
[62668.666461] [ INFO: possible circular locking dependency detected ]
[62668.673871] 3.3.8 #40 Tainted: G O
[62668.679263] -------------------------------------------------------
[62668.686640] dnsmasq/2160 is trying to acquire lock:
[62668.692656] (&(&sch->busylock)->rlock){+.-...}, at: [<812dfccc>] dev_queue_xmit+0x2bc/0x6d0
[62668.702334]
[62668.702334] but task is already holding lock:
[62668.710399] (&(&pch->downl)->rlock){+.-...}, at: [<f8c1a05d>] ppp_unregister_channel+0x121d/0x1e10 [ppp_generic]
[62668.721966]
[62668.721966] which lock already depends on the new lock.
[62668.721967]
[62668.733587]
[62668.733588] the existing dependency chain (in reverse order) is:
[62668.743358]
[62668.743358] -> #3 (&(&pch->downl)->rlock){+.-...}:
[62668.751962] [<8105d1cc>] lock_acquire+0x6c/0x90
[62668.758238] [<813612d8>] _raw_spin_lock_bh+0x38/0x50
[62668.764966] [<f8c1a05d>] ppp_unregister_channel+0x121d/0x1e10 [ppp_generic]
[62668.773700] [<f8c1a995>] ppp_unregister_channel+0x1b55/0x1e10 [ppp_generic]
[62668.782480] [<f8c1ad15>] ppp_output_wakeup+0xc5/0xe80 [ppp_generic]
[62668.790498] [<810a5ab4>] vfs_write+0x94/0x130
[62668.796561] [<810a5d28>] sys_write+0x38/0x70
[62668.802609] [<81361931>] syscall_call+0x7/0xb
[62668.808685]
[62668.808685] -> #2 (&(&ppp->wlock)->rlock){+.-...}:
[62668.817270] [<8105d1cc>] lock_acquire+0x6c/0x90
[62668.823523] [<813612d8>] _raw_spin_lock_bh+0x38/0x50
[62668.830187] [<f8c1a549>] ppp_unregister_channel+0x1709/0x1e10 [ppp_generic]
[62668.838876] [<f8c1ab85>] ppp_unregister_channel+0x1d45/0x1e10 [ppp_generic]
[62668.847534] [<812df91b>] dev_hard_start_xmit+0x43b/0x530
[62668.854542] [<812f1be6>] sch_direct_xmit+0x56/0x200
[62668.861054] [<812dfdea>] dev_queue_xmit+0x3da/0x6d0
[62668.867597] [<812e5fca>] neigh_direct_output+0xa/0x10
[62668.874310] [<81306a1a>] ip_finish_output+0x30a/0x3c0
[62668.881001] [<81307e8f>] ip_output+0xdf/0x110
[62668.886991] [<81304443>] ip_forward_finish+0x93/0xd0
[62668.893524] [<813046f7>] ip_forward+0x277/0x350
[62668.899629] [<81302d13>] ip_rcv_finish+0x3f3/0x490
[62668.905982] [<8130333f>] ip_rcv+0x29f/0x2f0
[62668.911687] [<812ddf56>] __netif_receive_skb+0x3a6/0x410
[62668.918530] [<812de1cf>] netif_receive_skb+0xbf/0xd0
[62668.925009] [<81348ab3>] br_handle_frame_finish+0x173/0x1a0
[62668.932026] [<81348c87>] br_handle_frame+0x1a7/0x1d0
[62668.938432] [<812dde8e>] __netif_receive_skb+0x2de/0x410
[62668.945123] [<812de1cf>] netif_receive_skb+0xbf/0xd0
[62668.951501] [<812debd5>] napi_skb_finish+0x25/0x50
[62668.957667] [<812decf3>] napi_gro_receive+0xf3/0x100
[62668.964024] [<f9241fba>] e1000e_set_ethtool_ops+0xd0a/0x18b0 [e1000e]
[62668.971821] [<f9243556>] e1000e_get_stats64+0x9f6/0x2d40 [e1000e]
[62668.979269] [<f9244945>] e1000e_get_stats64+0x1de5/0x2d40 [e1000e]
[62668.986857] [<812de3c5>] net_rx_action+0x65/0x140
[62668.992904] [<8102c451>] __do_softirq+0x81/0x130
[62668.998876]
[62668.998877] -> #1 (_xmit_PPP#2){+.-...}:
[62669.005779] [<8105d1cc>] lock_acquire+0x6c/0x90
[62669.011625] [<81361023>] _raw_spin_lock+0x33/0x40
[62669.017642] [<812f1bc6>] sch_direct_xmit+0x36/0x200
[62669.023832] [<812dfdea>] dev_queue_xmit+0x3da/0x6d0
[62669.030049] [<812e5fca>] neigh_direct_output+0xa/0x10
[62669.036426] [<81306a1a>] ip_finish_output+0x30a/0x3c0
[62669.042794] [<81307e8f>] ip_output+0xdf/0x110
[62669.048471] [<813075a3>] ip_local_out+0x43/0x60
[62669.054295] [<813086e9>] ip_send_skb+0x9/0x60
[62669.059964] [<8132466d>] udp_send_skb+0x25d/0x2d0
[62669.065963] [<81326126>] udp_sendmsg+0x576/0x840
[62669.071848] [<8132d0f0>] inet_sendmsg+0xc0/0xd0
[62669.077669] [<812cca74>] sock_sendmsg+0xa4/0xc0
[62669.083457] [<812ced62>] sys_sendto+0xb2/0xe0
[62669.089087] [<812cf5e0>] sys_socketcall+0x160/0x2b0
[62669.095239] [<81361931>] syscall_call+0x7/0xb
[62669.100864]
[62669.100864] -> #0 (&(&sch->busylock)->rlock){+.-...}:
[62669.108772] [<8105c795>] __lock_acquire+0xf55/0x1570
[62669.115007] [<8105d1cc>] lock_acquire+0x6c/0x90
[62669.120829] [<81361023>] _raw_spin_lock+0x33/0x40
[62669.126797] [<812dfccc>] dev_queue_xmit+0x2bc/0x6d0
[62669.132951] [<f9043493>] 0xf9043493
[62669.137680] [<f90434ca>] 0xf90434ca
[62669.142408] [<f8c1a06c>] ppp_unregister_channel+0x122c/0x1e10 [ppp_generic]
[62669.144361] [<f8c1a995>] ppp_unregister_channel+0x1b55/0x1e10 [ppp_generic]
[62669.144364] [<f8c1ab85>] ppp_unregister_channel+0x1d45/0x1e10 [ppp_generic]
[62669.144366] [<812df91b>] dev_hard_start_xmit+0x43b/0x530
[62669.144367] [<812f1be6>] sch_direct_xmit+0x56/0x200
[62669.144369] [<812dfdea>] dev_queue_xmit+0x3da/0x6d0
[62669.144370] [<812e5fca>] neigh_direct_output+0xa/0x10
[62669.144372] [<81306a1a>] ip_finish_output+0x30a/0x3c0
[62669.144374] [<81307e8f>] ip_output+0xdf/0x110
[62669.144376] [<813075a3>] ip_local_out+0x43/0x60
[62669.144377] [<813086e9>] ip_send_skb+0x9/0x60
[62669.144379] [<8132466d>] udp_send_skb+0x25d/0x2d0
[62669.144380] [<81326126>] udp_sendmsg+0x576/0x840
[62669.144382] [<8132d0f0>] inet_sendmsg+0xc0/0xd0
[62669.144383] [<812cca74>] sock_sendmsg+0xa4/0xc0
[62669.144385] [<812ced62>] sys_sendto+0xb2/0xe0
[62669.144387] [<812cf5e0>] sys_socketcall+0x160/0x2b0
[62669.144388] [<81361931>] syscall_call+0x7/0xb
[62669.144390]
[62669.144391] other info that might help us debug this:
[62669.144391]
[62669.144392] Chain exists of:
[62669.144392] &(&sch->busylock)->rlock --> &(&ppp->wlock)->rlock --> &(&pch->downl)->rlock
[62669.144394]
[62669.144394] Possible unsafe locking scenario:
[62669.144395]
[62669.144395] CPU0 CPU1
[62669.144396] ---- ----
[62669.144396] lock(&(&pch->downl)->rlock);
[62669.144397] lock(&(&ppp->wlock)->rlock);
[62669.144398] lock(&(&pch->downl)->rlock);
[62669.144399] lock(&(&sch->busylock)->rlock);
[62669.144400]
[62669.144401] *** DEADLOCK ***
[62669.144401]
[62669.144402] 6 locks held by dnsmasq/2160:
[62669.144403] #0: (rcu_read_lock){.+.+..}, at: [<81306960>] ip_finish_output+0x250/0x3c0
[62669.144405] #1: (rcu_read_lock_bh){.+....}, at: [<812dfa10>] dev_queue_xmit+0x0/0x6d0
[62669.144408] #2: (_xmit_PPP#2){+.-...}, at: [<812f1bc6>] sch_direct_xmit+0x36/0x200
[62669.144410] #3: (&(&ppp->wlock)->rlock){+.-...}, at: [<f8c1a549>] ppp_unregister_channel+0x1709/0x1e10 [ppp_generic]
[62669.144413] #4: (&(&pch->downl)->rlock){+.-...}, at: [<f8c1a05d>] ppp_unregister_channel+0x121d/0x1e10 [ppp_generic]
[62669.144416] #5: (rcu_read_lock_bh){.+....}, at: [<812dfa10>] dev_queue_xmit+0x0/0x6d0
[62669.144418]
[62669.144419] stack backtrace:
[62669.144420] Pid: 2160, comm: dnsmasq Tainted: G O 3.3.8 #40
[62669.144421] Call Trace:
[62669.144424] [<8135b0a8>] ? printk+0x18/0x1a
[62669.144426] [<8135b8f4>] print_circular_bug+0x234/0x23e
[62669.144428] [<8105c795>] __lock_acquire+0xf55/0x1570
[62669.144430] [<8105d1cc>] lock_acquire+0x6c/0x90
[62669.144431] [<812dfccc>] ? dev_queue_xmit+0x2bc/0x6d0
[62669.144432] [<81361023>] _raw_spin_lock+0x33/0x40
[62669.144434] [<812dfccc>] ? dev_queue_xmit+0x2bc/0x6d0
[62669.144435] [<812dfccc>] dev_queue_xmit+0x2bc/0x6d0
[62669.144436] [<812dfa10>] ? dev_hard_start_xmit+0x530/0x530
[62669.144438] [<f9043493>] 0xf9043492
[62669.144440] [<812f0ea0>] ? eth_rebuild_header+0x70/0x70
[62669.144442] [<f90434ca>] 0xf90434c9
[62669.144445] [<f8c1a06c>] ppp_unregister_channel+0x122c/0x1e10 [ppp_generic]
[62669.144446] [<8105d818>] ? mark_held_locks+0xb8/0xf0
[62669.144448] [<813616b5>] ? _raw_spin_unlock_irqrestore+0x45/0x60
[62669.144450] [<8105d96c>] ? trace_hardirqs_on_caller+0x11c/0x1a0
[62669.144451] [<8105d9fb>] ? trace_hardirqs_on+0xb/0x10
[62669.144453] [<812d4669>] ? skb_dequeue+0x59/0x70
[62669.144456] [<f8c1a995>] ppp_unregister_channel+0x1b55/0x1e10 [ppp_generic]
[62669.144457] [<812d4417>] ? skb_queue_tail+0x37/0x50
[62669.144460] [<f8c1ab85>] ppp_unregister_channel+0x1d45/0x1e10 [ppp_generic]
[62669.144461] [<812df91b>] dev_hard_start_xmit+0x43b/0x530
[62669.144463] [<812f1bc6>] ? sch_direct_xmit+0x36/0x200
[62669.144465] [<812f1be6>] sch_direct_xmit+0x56/0x200
[62669.144467] [<8136102a>] ? _raw_spin_lock+0x3a/0x40
[62669.144468] [<812dfdea>] dev_queue_xmit+0x3da/0x6d0
[62669.144470] [<812dfa10>] ? dev_hard_start_xmit+0x530/0x530
[62669.144471] [<81306960>] ? ip_finish_output+0x250/0x3c0
[62669.144473] [<812e5fca>] neigh_direct_output+0xa/0x10
[62669.144475] [<81306a1a>] ip_finish_output+0x30a/0x3c0
[62669.144477] [<81306960>] ? ip_finish_output+0x250/0x3c0
[62669.144479] [<81307e8f>] ip_output+0xdf/0x110
[62669.144480] [<81306710>] ? ip_fragment+0x850/0x850
[62669.144482] [<813075a3>] ip_local_out+0x43/0x60
[62669.144484] [<813086e9>] ip_send_skb+0x9/0x60
[62669.144485] [<8132466d>] udp_send_skb+0x25d/0x2d0
[62669.144487] [<81326126>] udp_sendmsg+0x576/0x840
[62669.144489] [<81305d40>] ? ip_setup_cork+0xf0/0xf0
[62669.144491] [<8132d0f0>] inet_sendmsg+0xc0/0xd0
[62669.144492] [<8132d030>] ? inet_autobind+0x60/0x60
[62669.144494] [<812cca74>] sock_sendmsg+0xa4/0xc0
[62669.144497] [<8108e4ae>] ? might_fault+0x2e/0x80
[62669.144498] [<8108e4ae>] ? might_fault+0x2e/0x80
[62669.144500] [<8108e4f4>] ? might_fault+0x74/0x80
[62669.144503] [<8116022d>] ? _copy_from_user+0x3d/0x60
[62669.144504] [<812ce6ce>] ? move_addr_to_kernel+0x2e/0x50
[62669.144506] [<812ced62>] sys_sendto+0xb2/0xe0
[62669.144508] [<8105ce3d>] ? lock_release_non_nested+0x8d/0x250
[62669.144510] [<8108e4ae>] ? might_fault+0x2e/0x80
[62669.144511] [<8108e4ae>] ? might_fault+0x2e/0x80
[62669.144513] [<812cf5e0>] sys_socketcall+0x160/0x2b0
[62669.144515] [<81361931>] syscall_call+0x7/0xb
[62669.144516] [<81360000>] ? wait_for_common+0x30/0x110 |
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